JPS5534730A - Automatic voltage switching circuit - Google Patents

Automatic voltage switching circuit

Info

Publication number
JPS5534730A
JPS5534730A JP10723378A JP10723378A JPS5534730A JP S5534730 A JPS5534730 A JP S5534730A JP 10723378 A JP10723378 A JP 10723378A JP 10723378 A JP10723378 A JP 10723378A JP S5534730 A JPS5534730 A JP S5534730A
Authority
JP
Japan
Prior art keywords
current
power source
voltage
make
output fixed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP10723378A
Other languages
Japanese (ja)
Other versions
JPS5538698B2 (en
Inventor
Sumio Wada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Electric Works Co Ltd
Original Assignee
Matsushita Electric Works Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Works Ltd filed Critical Matsushita Electric Works Ltd
Priority to JP10723378A priority Critical patent/JPS5534730A/en
Publication of JPS5534730A publication Critical patent/JPS5534730A/en
Publication of JPS5538698B2 publication Critical patent/JPS5538698B2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Dc-Dc Converters (AREA)

Abstract

PURPOSE: To make automatically an output fixed even in case of the change of a power source voltage by changing an oscillation frequency and controlling the base current of an originating transistor to make the output fixed when the power source voltage is high.
CONSTITUTION: When the rectified voltage obtained by rectifying an AC power source is applied across power source input ends I1 and I2, an oscillator circuit is operated by the switching operation of oscillation transistor Tr1. Then, when a high voltage is generated in output coil L3, a current is flowed to light emission diode LED of photo coupler 1, and photo diode Pd is operated to turn on Tr2. Thus, when the current voltage becomes high, a current is flowed to photo diode Pd, and the flowing start time of the base current of Tr2 becomes rapid, and the peak value of the collector current of Tr1 is restrained low to make the output fixed. Then, the cut-off time of Tr1 becomes rapid to change the oscillation frequency.
COPYRIGHT: (C)1980,JPO&Japio
JP10723378A 1978-08-31 1978-08-31 Automatic voltage switching circuit Granted JPS5534730A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10723378A JPS5534730A (en) 1978-08-31 1978-08-31 Automatic voltage switching circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10723378A JPS5534730A (en) 1978-08-31 1978-08-31 Automatic voltage switching circuit

Publications (2)

Publication Number Publication Date
JPS5534730A true JPS5534730A (en) 1980-03-11
JPS5538698B2 JPS5538698B2 (en) 1980-10-06

Family

ID=14453855

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10723378A Granted JPS5534730A (en) 1978-08-31 1978-08-31 Automatic voltage switching circuit

Country Status (1)

Country Link
JP (1) JPS5534730A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378585A (en) * 1980-02-28 1983-03-29 Siemens Aktiengesellschaft Free-running blocking oscillator-type converter
US4443838A (en) * 1980-12-01 1984-04-17 Omron Tateisi Electronics Co. Regulated single-ended self oscillating, DC-DC converter

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5768435A (en) * 1980-10-14 1982-04-26 Koudai Shiyouken Kk Wood building

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4378585A (en) * 1980-02-28 1983-03-29 Siemens Aktiengesellschaft Free-running blocking oscillator-type converter
US4443838A (en) * 1980-12-01 1984-04-17 Omron Tateisi Electronics Co. Regulated single-ended self oscillating, DC-DC converter

Also Published As

Publication number Publication date
JPS5538698B2 (en) 1980-10-06

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